Answer:
D. phototropism.
Explanation:
Phototropism is the behavior of an organism in which it reacts to sunlight. <u>Tropical trees show an example of phototropism</u> - they need the sunlight and that is why they tend to grow taller and towards the source of light. This is called <u>positive phototropism.</u>
A type of phototropism where plants grow away from the sunlight is called <u>negative phototropism</u>.